I am unable to load the next view on button press. I have created a button and attached the checkButtonPress action to the button in the IB. But when I press the button on the simulator the next view (ViewOne.xib) do not load. When I tried to debug the code; it is printing the NSLog(#"View One");written in the if statement below which means the code is reaching to that point but the next view is not loading. I have already created the ViewOne .h, .m .xib files. Following is the code written in check1ViewController.m implementation file:
#import "check1ViewController.h"
#import "ViewOne.h"
#implementation check1ViewController
-(IBAction) checkButtonPress: (id) sender{
int button = [sender tag];
if(button==1)
{
NSLog(#"View One");
ViewOne *tempObj = [[ViewOne alloc]initWithNibName:#"ViewOne" bundle:nil];
[self.navigationController pushViewController:tempObj animated:YES];
[tempObj release];
}
else if(button==2)
{
NSLog(#"View Two");
}
}
/*
// The designated initializer. Override to perform setup that is required before the view is loaded.
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
if ((self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil])) {
// Custom initialization
}
return self;
}
*/
/*
// Implement loadView to create a view hierarchy programmatically, without using a nib.
- (void)loadView {
}
*/
/*
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
[super viewDidLoad];
}
*/
- (void)dealloc {
[super dealloc];
}
#end
The code is running fine with no errors or warnings.
Any suggestions if I am missing any part in the IB or in the code to be written or do need to override any method in any of the file ... or did I misplace IBAction before any other method
Sorry but I am new to iPhone dev so not sure what I did wrong ?
Thanks in advance
You application is not having navigation controller so add next view on window for this make object of AppDelegate class and then access window to addView.
YourAppDelegate *obj=(YourAppDelegate *)[[UIApplication sharedApplication] delegate];
[obj.window addSubView:viewController.view];
Related
I am trying to add a page with a UIScrollView and UIPageControl to my app. I am making the call to the new class from a UITableView as below.
MultiPageViewController *mpvc = [[MultiPageViewController alloc]initWithNibName:#"MultiPageViewController" bundle:[NSBundle mainBundle]];
[[self navigationController]pushViewController:mpvc animated:YES];
The viewDidLoad function is never called, thus my UIScrollview and UIPageControl are never initialized. When I go along further and call viewWillAppear these objects are both still nil. Further the view never appears only a white screen. Below is the code from initWithNibName and viewDidLoad.
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
NSLog(#"initWithNibName returned self != null");
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
NSLog(#"View did load called");
}
Thanks for your help in advance.
I need to change the URL of a WebView (located in WebViewViewController) using buttons in View Controller 1 (called PracticeViewController). I totally understand how to change the web View when it is in the same View Controller as the buttons, but I don't understand how to get the buttons to affect the WebView when the WebView is in a different ViewController than the buttons. Below is the code I currently have:
PracticeViewController.h
#import <UIKit/UIKit.h>
#interface PracticeViewController : UIViewController
- (IBAction)passGoogleButton:(id)sender;
- (IBAction)passYahooButton:(id)sender;
- (IBAction)passBingButton:(id)sender;
/* ok I tried to make this as clear as possible, and you can look at the other files if you don't understand what I mean, but at its core I want to change the web site loaded by the Web View by clicking on the buttons in the other View Controller */
#end
space (BTW is there an easier way to post on StackOverFlow Besides pressing space 4 times for every line of code? am I missing something?)
PracticeViewController.m
#import "PracticeViewController.h"
#import "WebViewViewController.h"
#interface PracticeViewController ()
#end
#implementation PracticeViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (IBAction)passGoogleButton:(id)sender {
WebViewViewController.webSiteURL = #"http://www.google.com";
/* This supposedly works on a tutorial I saw, but Xcode flags it with the error 'Property webSiteURL not found on object of type 'WebViewViewController'' */
}
- (IBAction)passYahooButton:(id)sender {
WebViewViewController.webSiteURL = #"http://www.yahoo.com";
//same error as above
}
- (IBAction)passBingButton:(id)sender {
WebViewViewController.webSiteURL = #"http://www.bing.com";
//same error as above
}
#end
space
WebViewViewController.h
#import <UIKit/UIKit.h>
#interface WebViewViewController : UIViewController
{
UIWebView *myWebView;
NSString *webSiteURL;
}
#property (weak, nonatomic) IBOutlet UIWebView *myWebView;
#property (strong, nonatomic) NSString *webSiteURL;
/* I don't entirely understand what 'strong' means but I know it has to do with memory retention and that it (supposedly) should be used when I wan to transfer the value of the string 'webSiteURL' to the other ViewController */
#end
space
WebViewViewController.m
#import "WebViewViewController.h"
#interface WebViewViewController ()
#end
#implementation WebViewViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
[myWebView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:webSiteURL]]];
/* As you can see above, the WebView loads from the string 'webSiteURL' but I can't figure out how to assign different values to it based on what button is clicked in the other View Controller so that it will run in ' - (void)viewDidLoad.' I already know how to transfer the value of the string to other things within another view controller (like into a label or a text field) but what I really need to know is how to get the string 'webSiteURL' to change before the view is loaded */
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#end
You have the right idea but you are missing a step here. You are never creating an instance of webViewController.
What you need somewhere is...
webViewcontroller *MyWebController = [[webViewController alloc] init];
It depends on how you are presenting the WebViewController. If you simply want the button to pop up the WebViewController modally you could use the following:
- (IBAction)passGoogleButton:(id)sender {
webViewController *myWebVC = [[webViewController alloc] init];
[myWebVC setWebSiteURL:#"http://www.google.com"];
[self presentViewController:myWebVC animated:YES completion:nil];
}
So, you can see here. You create the instance of the webViewController called myWebVC. Then you pass the string to it. So when myWebVC loads and it hits viewDidLoad, it will use the string that you passed in already and load the web view with that content. Hope that helps.
Also, Make sure you #synthesize your properties in your .m files.
You can use nsnotificationcenter to accomplish this task.
First register to notificationcenter in WebViewController, then send notification from another controller.
Here's a sample for registering to notificationcenter in WebViewController
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(nMessageOpenURL:) name:#"nMessageOpenURL" object:nil];
This is the code to run the logic when you receive the notification. (in WebViewController)
- (void)nMessageOpenURL:(NSNotification *)note {
//run the logic in here.
}
And finally this is the code where you trigger the notification.
[[NSNotificationCenter defaultCenter] postNotificationName:#"nMessageOpenURL" object:nil];
Here's the Apple documentation.
I got to know that you are trying to pass the value of the string of url between two view controllers but you are not getting it right!!
So if you are using storyboard you can try out passing this value using Segue. For Eg: you can use prepareForSegue to set the different values using if-else construct.
And if you are not using segue the best practice to pass those values will be using delegate.
Just create a delegate method and pass the url string as an argument.
Hope this works :)
I have a view controlled app. On my xib I have no webviews but I do have buttons that bring up classes that have webviews. So hit button one and a uiwebview pops up so on and so forth.
Now in one of my classes I pull up a remote webpage that has a link on it. I want to over-ride that button link with shouldStartLoadwithrequest. How ever this never seems to get called.
Right now my class is called Tenth.m and I have this code in my view controller
- (BOOL)webView:(UIWebView*)webView shouldStartLoadWithRequest:(NSURLRequest*)request navigationType:(UIWebViewNavigationType)navigationType {
NSLog(#" Test spot 1");
NSString* scheme = [[request URL] scheme];
if ([#"didTap" isEqual:scheme]) {
// Call your method
NSLog(#" Test spot 2");
[self didTapButton1];
return NO;
} else {
NSLog(#" Test spot 3");
return YES;
}}
But I get nothing (none of my NSLogs). I have tried putting this into my Tenth.m class and still nothing. I have looked at other examples and even downloaded one but it only uses the viewcontroller and delegates classes. No third class.
I'm lost as to why its not getting called.
Here is my third class
#import "Tenth.h"
#implementation Tenth
- (void)awakeFromNib
{
[category10 loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:#"http://www.mywebsite.com/api/didtap.php"]]];
}
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)dealloc
{
[super dealloc];
}
- (void)didReceiveMemoryWarning
{
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
#pragma mark - View lifecycle
/*
// Implement loadView to create a view hierarchy programmatically, without using a nib.
- (void)loadView
{
}
*/
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad
{
[super viewDidLoad];
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
return YES;
}
#end
remote page code
hello
Tenth.h file
#import <UIKit/UIKit.h>
#interface Tenth : UIViewController <UIWebViewDelegate> {
IBOutlet UIWebView *category10;
}
-(IBAction)back;
#end
My first guess is that the Web view does not have its delegate set. In order for it to call
- (BOOL)webView:(UIWebView*)webView shouldStartLoadWithRequest:(NSURLRequest*)request navigationType:(UIWebViewNavigationType)navigationType
The class containing this method needs to be set as the webview's delegate. So somewhere in the code there should be a line similar to webView.delegate = <variable>, where the variable is the instance of the class which has implemented the shouldStartLoadWithRequest: method.
This is often "self" when the webView is a subview of a viewController's view. But the way you have described your application, I am not sure if it will be self or not, but it sounds like it will not be self, but the name of the instance of a different class.
Maybe try this:
- (void)viewDidLoad
{
[super viewDidLoad];
// Remember to set web view delegate to self.
category10.delegate = self;
}
I went through the material regarding this issue but still can't figure it out completely.
The main issue is that i am using this method but the view does not show...
The app is built out of two view - the main one (i added it as a subview to the main nib) -
Has of a text field where i write some text.
Has a button that when pressed, the action method loads a second view that has a label with some text in it.
the source code of the first viewController:
#import <UIKit/UIKit.h>
#class TxtRunnerViewController;
#interface Itai_s_text_app_take_2ViewController : UIViewController {
int sliderSpeed;
IBOutlet UITextField *textInput;
TxtRunnerViewController *trvc;
}
#property (nonatomic, retain) IBOutlet UITextField *textInput;
#property (retain, nonatomic) TxtRunnerViewController *trvc;
- (IBAction)sliderChanged:(id)sender;//speed of text show changed
- (IBAction)textFieldDoneEditing:(id)sender;//dor 'DONE' on keyboard
- (IBAction)backgroundTap:(id)sender;//for handling tapping on background
- (IBAction)textEmButtonPressed:(id)sender;
#end
the .m of the first ViewController:
#import "Itai_s_text_app_take_2ViewController.h"
#import "TxtRunnerViewController.h"
#implementation Itai_s_text_app_take_2ViewController
#synthesize textInput;
#synthesize trvc;
- (IBAction)sliderChanged:(id)sender
{
UISlider *slider = (UISlider *)sender;
sliderSpeed = (int)(slider.value + 0.5f);//setting the speed determinned by the usr in slider
NSLog(#"Slider value is %#", sliderSpeed);
}
- (IBAction)textFieldDoneEditing:(id)sender
{
[sender resignFirstResponder];
NSLog(#"our text input is %#", textInput.text);
}
- (IBAction)backgroundTap:(id)sender
{
[textInput resignFirstResponder];
}
- (IBAction)textEmButtonPressed:(id)sender
{
NSLog(#"button pressed");
if ([textInput.text length]==0)
{
NSString *msg = nil;
msg = #"Write text to transmit";
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Forgot something?"
message:msg
delegate:self
cancelButtonTitle:#"Back"
otherButtonTitles:nil];
[alert show];
[alert release];
[msg release];
}
else { //init
NSLog(#"HI!");
if (self.trvc == nil)
{
NSLog(#"if accepted");
TxtRunnerViewController *tr = [[TxtRunnerViewController alloc] initWithNibName:#"TxtRunner"
bundle:nil];
self.trvc = tr;
[tr release];
}
[self.view removeFromSuperview];
[self.view insertSubview:trvc.view atIndex:0];
NSLog(#"InsertAtIndex was operated...!");
//[self.view addSubview:tvc.view];
}
}
/*
// The designated initializer. Override to perform setup that is required before the view is loaded.
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
*/
/*
// Implement loadView to create a view hierarchy programmatically, without using a nib.
- (void)loadView {
}
*/
/*
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
[super viewDidLoad];
}
*/
/*
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
*/
- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
if(self.trvc.view.superview == nil)
self.trvc = nil;
}
- (void)viewDidUnload {
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)dealloc {
[trvc release];
[super dealloc];
}
The second View is simply empty (has a label added to it in it's nib file):
#import
#interface TxtRunnerViewController : UIViewController {
}
#end
It's .m file is the default one, added no code to it.
When i press the button in the first view - it's view disappears but the second view does not appear instead, only a blank white view appears, nothing on it.
Doe
If you push the TxtRunnerViewController it will completely hide the first one, but it still exist in background. (without removeFromSuperview)
TxtRunnerViewController *vw = [[TxtRunnerViewController alloc]initWithNibName:#"TxtRunner" bundle:nil];
[self.view pushViewController:vw.view animated:NO];
[vw release];
To remove the first view it's a bit more difficult. You would need to implement a delegate in RootViewController which will be fired after clicking the done Button of the first view. Then in your RootViewController some code is executed which displays the second view and removes the first view.
For a delegate sample open the Utility Application Sample when creating a new project and figure out how it works or search some examples online.
The line:
[self.view removeFromSuperview];
Removes the view from its super
then the call
[self.view insertSubview:trvc.view atIndex:0];
Adds trvc to it - but that view has been removed and not visible anymore.
You need to add trvc to the superview.
I'm trying to create an application that uses the iPhone MapView (under Google Code). I can't figure out how to integrate this thing into my application without handwriting the entire UI, ie not using the IB at all.
How can I use the Interface builder to create all of my menus and such but add the MapView in? Do I need to edit the MapView to make it an IB component?
Thanks!
EDIT:
#pgb
Here is my code, it still just displays a blank UIView, I have connected everything up on the IB side.
//
// NewTestViewController.h
// NewTest
//
#import <UIKit/UIKit.h>
#interface NewTestViewController : UIViewController {
UIView* mapPlaceholder;
}
#property (nonatomic, retain) IBOutlet UIView* mapPlaceholder;
#end
//
// NewTestViewController.m
// NewTest
//
#import "NewTestViewController.h"
#import "MapView.h"
#implementation NewTestViewController
#synthesize mapPlaceholder;
// The designated initializer. Override to perform setup that is required before the view is loaded.
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
if (self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]) {
MapView *mapView = [[[MapView alloc] initWithFrame:
[[UIScreen mainScreen] applicationFrame]] autorelease];
[mapPlaceholder addSubview:mapView];
}
return self;
}
/*
// Implement loadView to create a view hierarchy programmatically, without using a nib.
- (void)loadView {
}
*/
/*
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
[super viewDidLoad];
}
*/
/*
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
*/
- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
- (void)viewDidUnload {
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)dealloc {
[mapPlaceholder.subviews release];
[super dealloc];
}
#end
NEVERMIND FIGURED IT OUT THANGS PBG
You can probably create the whole interface in IB, add an empty UIView as the placeholder view, and then use addSubview: to add the MapView instance to the view hierarchy.
Your placeholder view can be defined as an IBOutlet, so you can then add the MapView from your UIViewController instance.
In IB you can add a UIView and then change the type of the view to any custom UIView - I'm assuming MapView subclasses UIView just as MKMapView does...
I'm trying to create an application that uses the iPhone MapView (under Google Code).
Why not use MapKit? Surely IB comes with an MKMapView in its Library.